package Chapter1_4Low;

public class Accumulator {
    private double total;
    private int N;
    public void addDataValue(double val){
        N++;
        total+=val;
    }
    public double mean(){
        return total/N;
    }
    public String toString(){
        return "Mean("+N+" values): "+String.format("%7.5f",mean());
    }
}
